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http://dx.doi.org/10.5229/JKES.2003.6.2.103

Electrochemical Characteristics of Metal Coated Graphite for Anodic Active Material of Lithium Secondary Battery  

Choi, Won-Chang (Dept. of Materials Science, Korea University)
Lee, Joong-Kee (Eco-Nano Research Center, KIST)
Byun, Dong-Jin (Dept. of Materials Science, Korea University)
Cho, Byung-Won (Eco-Nano Research Center, KIST)
Publication Information
Journal of the Korean Electrochemical Society / v.6, no.2, 2003 , pp. 103-112 More about this Journal
Abstract
Various kinds of metals were coated on synthetic graphite in order to investigate the relationship between film characteristics and their electrochemical performance. Gas suspension spray coating method was employed for the coating of synthetic graphite. In our experimental range, all of the metal coated synthetic graphite showed the higher capacity than that of raw material at high C-rate mainly due to decrease in impedance of passivation film. In cyclic voltammetry experiments, silver-coated and tin-coated graphite anodes found the lithium-alloy reaction. Considering smaller amount of metal coating, the most increase in discharge capacity was caused by improvement of conductivity of the electrode. When single-component metal was coated, silver-coated graphite anode exhibited the highest discharge capacity and better cycleability. Double components of silver-nickel coated active material showed the highest discharge capacity, rate capability and the best cycle performance in the range of our experiments.
Keywords
Synthetic graphite; Metal coating; Anode; Lithium secondary battery;
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